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FAQ 4.72 How do I handle binary data correctly?

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4.72: How do I handle binary data correctly?

Perl is binary clean, so it can handle binary data just fine. On Windows
or DOS, however, you have to use "binmode" for binary files to avoid
conversions for line endings. In general, you should use "binmode" any
time you want to work with binary data.

Also see "binmode" in perlfunc or perlopentut.

If you're concerned about 8-bit textual data then see perllocale. If you
want to deal with multibyte characters, however, there are some gotchas.
See the section on Regular Expressions.


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